Gorge cut by the Colorado River , northwestern Arizona, U.S. Noted for its rock formations and coloration, it is about 0.
1–18 mi (0.2–29 km) wide and extends from northern Arizona to Grand Wash Cliffs, near the Nevada border, a distance of about 277 mi (446 km). The deepest section, 56 mi (90 km) long, is within Grand Canyon National Park, which covers the river's length from Lake Powell to Lake World Heritage site .